Bearing mounting for use on tapered mill roll necks and the like



June 7, 1960 s. M. wr-:cKsTl-:IN 2,939,750

BEARING MOUNTING FOR USE oN TAPERED MILL ROLL NECKS AND THE LIKE Filed Sept. 29, 1958 2 Sheets-Sheet 1 June 7, 1960 s. M. wEcKsTElN 2,939,750

BEARING MOUNTING FOR USE ON TAPERED MILL ROLL. NECKS AND THE LIKE Filed Sept. 29, 1958 2 Sheets-Sheet 2 WQ mm mda S. m.

lBEARING MOUNTING FOR USE N TAPERED MILL ROLL NECKS AND THE LIKE Samson M. Weckstein, Canton, Ohio, assigner to The Timken Roller Bearing Company, Canton, Ohio, a corporation of Ohio Filed sept. 29, 195s, ser. No. 764,011

15 claims. (cl. soa-236) The present invention relates generally to bearing mountings and more particularly to bearing mountings for use on tapered mill roll necks and the like.

Prior bearing mountings for tapered mill roll necks and the like have been devised, but heretofore, no provision has been made to simplify the design by eliminating the need for a separate backing ring and incorporating the backing ring as an integral part of an inner race member. This feature reduces the distance from the end face of the mill roll body to the center line of the bearing assembly and thereby reduces the stresses on the neck or journal member. This provision also makes it possible to use smaller diameter necks and if desired smaller diameter roll bodies. By the same token a larger initial roll body may be used and its diameter reduced as it wears to prolong its useful life.

It is an object of the Vpresent invention therefore to provide a bearing mounting for a tapered mill roll neck or the like that reduces to a minimum the necessary neck length so as to improve the stress conditions there- Another object of the present invention is to provide an inexpensive bearing mounting for a tapered mill roll neck by reducing the number 'of bearing parts therein.

Another object of the present vinvention is to provide means in a bearing mounting for absorbing the damaging shock when the mounting is broken loose from its mounted position so that no damage will occur to the bearing parts.

Another object of the present invention is to provide a bearing mounting for a tapered mill roll neck or like member that can be quickly broken loose from a fitted position on the neck or like member by hydraulic pressure without damaging the bearing parts thereby.

Another object of the present invention is to provide a bearing mounting with motion restricting means to prevent damage to the bearing members when moving the members during dismounting thereof.

Another object ofthe present invention is to provide a bearing mounting for a tapered mill roll neck that is ltted to the neck so .as to be suitable for heavy duty `high-speed operation and yet which can be removed quickly Iand easily from the neck without damaging the bearing members.

Another object of the present invention is to provide a bearing mounting for a tapered mill roll neck or like journal member that can be removed therefrom in minimum time, with minimum labor, and without damaging the parts thereof.

United States Patent A*if* ice ing members during the loosening thereof. The invention further includes improved means for sealing the bearing mounting directly to the neck or to the body of the mill roll itself. t

Other objects and advantages of the present invention will become apparent after consideration of the following specification andthe accompanying drawings.

In the drawings:

Fig. 1 is a fragmentary elevational view in section, showing a bearing mounting constructed according to the teachings of the present invention and installed on a t tapered mill roll neck,

Still another object of the present invention is to p mounting adapted to be interference fitted onto a tapered mill roll neck or shaft,` which mounting includes pressure fluid means for quickly loosening the mounting on the neck yand means for preventing damage to the bear- Fig. 2 is a fragmentary elevational view in section, showing a modification of the bearing mounting of Fig.

l on a tapered mill roll neck, and

Fig. 3 is an elevational view in section showing a modification of the bearing mounting of Fig. 2 installed on a tapered mill roll neck.

Referring to the drawings, and particularly to Figs. 1 :and 3, 10 refers to a tapered mill roll neck which is shown formed integral with mill roll body 12. Extending endwardly from the tapered neck 10, and also formed integrally therewith, is a smaller diameter extension 14 which has an outside groove 16 therein. An annular thrust ring 18 is removably positioned in the groove 16 yand extends outwardly therefrom to provide a backstop for another thrust ring or sleeve 20 that has an outside threaded portion 19.

The tapered neck 10 is adapted to receive the inner race portions of a bearing assembly 21. Fig. l shows the bearing assembly 21 having four rows ofY bearing rollers. The innermost row of bearing rollers, designated by number 22, has its lassociated inner race 24 mounted nearest to end face 25 on the mill roll body 12; the two middle rows of bearing rollers, designated 26 and 28, are disposed in races on a common inner race ring 3u; and the outermost row of rollers 32 has an associated inner racc 34. The races 24, 30 and 34 are installed on the tapered roll mill neck 10 and have an interference fit therewith.

The rows of bearing rollers 22, 26, 28 and 32 engage outer race members designated by the numbers 36 and 38. The member 36 has two race surfaces that engage the rows of rollers22 and 26, and the member 38 has two race surfaces that engage the rows of Yrollers 28 and 32. The outer race members 36 and 38 are positioned in a bearing housing 40 which is installed in a window opening in a mill housing or stationary member (not shown). The bearing housing 40 is provided at its outer side with a limiting rim or ange 42 to prevent movement thereof completely through the mill housing. The neck 10 has a steeply tapered portion 44 adjacent to the end face 25 of the mill roll body 12 which has the modified appearance of a fillet. The portion 44 is shown separated from the rest of the neck 10 by `a short cylindrical neck section 46, and the section 46 and the portion 44 receive a backing ring 48 for the bearing assembly 21. The outer surface of the backing ring 48 is provided with a cylindrical surface 50 which makes sliding and sealing engagement with a suitable seal 52 carried on the housing 40. In Fig. l, the backing ring 48, to the right of the seal 52, has an annular cavity 54 which receives a portion of the seal 52 and which `helps to prevent dust and dirt from settling on` the seal 52.

To the left of the seal 52 the lbacking ring 48 is turned down to form a second cylindrical surface 56,

and the outer end face of the backing ring 48 forms p an abutment surface for the inner race 24. When ingroove 58 receives at angeift) on thev housing or "chuck 40 and provides space in which said llange 60 can move "iiilly vTlieiiige '60"isof`particular importance to the present invention as will be shown hereinafter. n :Qn the outer side of theinner race34 is positioned an 'fa'nnularspacer or pressurefringvZ. .'Tocthe'left and veugag edtherevvithis a threaded slcevelnember 64 which "is threaded upon and cooperates vti'thtlie{thrustzring 20. When installing the bearing assembly`21'ontheneck 10, f the member"64'fis`fthreded on ring 20 ad'thereby.- moves thepre'ssure ringi`62 tofthefright into .engagement with the inner raiseJ 34 which at'this time'isinterference fitted I onto *they* neck lilas will be shownfhe'reinafter. .fglnterfflfe'rence'iits" are iwell"knownfto.'lthel 'rllingart arid.. ,are fchalracteri'zed by' 'tight' fsui'factsrfacecnta kbetv'vleen the members. interference fits:farellighly-dsirable if ,not absolutely necessaryv for.. heavyfload" high-speed-.rolljingperatiohs where valless,t'iglittitV would result.; in ""v'scufng" between :the eck' 10 ndfftheinefraees 3 4, 30 n andA 24, and `morerapidV 'wearbfl'the rA 'locking screwi' extends' throughv threaded bre1-67fi1aA the :mem- :"ber'" 64 and into bores 69 in'the'pressure'ring'to 'prei vent 4.relative .movement between' thelmemb'er elements "when theassembly 21 ,is installed.

'A clampi`ng block 66'is connected bythreaded mem- 'Nbe'rS68 tothe vleitend yof Athef husing40. The clampblo'ck 66 is-provided withA a Vsuitable sealing member "*70'that`slidably coacts with the outer surface ofthe presfsure'iring62' and also has anY axial flange 72 that en- ;ffgages'theouter end of the outer race38 and holds the "j-out'er'races and '38'in lixed positions in the housing ""40. "The clamping'blocks 66 associated withthe bearing assemblieson opposite sides of .the mill roll body 12 f'jare" adjusted to,provide"`a limitedV amount of play for f'fthe outer races 3 6 land' 38. So'rne play is` usually desiraz'ble 'because'clianges inj'the' 'temperature of the Amill roll body'lZr and theneck' 10 may produce axial movement C"'tue to 'expansion'and' contraction 'which' might otherdwise causeV binding. Y

CThe 'neckl'lO is'providedwith three outside annular -fgroves designated' 74; 76"and`y 78. AEach 'ofthegrooves 'Lf'isconnec't'edwith a radial 'and an axial passage (Fig. 3) i nthern'eck "10. "The radial passages are designated 79, ""80"`and"'81andtheaxial passages are designated 82,'i 83 and 84. l The .grooves 74, 76 and A78 are"`fo'r`med 'in t'heflnecky 10T so 'that "when'thebearing assembly is in- Sl""stalled;"each/,fofthe'inner Arace members willcover a 'iterenoteo'jthe'.groovesand forms a Vchamberthereith. "JThe l'ia'nljbeijs` so'` Vformed' "eachV communicate with n *oftl1epassaes'152i 83'or 84 Asotliaf pressure fluid besforccdirito'ithechambers foi-'loosening theinner 2^ racesfl'oni the neck :as-'WillI-befshowti hereinafter.

The `bearing*mourning 21y A`(Fig.' 1)"is installed `onfthe rolll :milt-neck 10"' byt `tirst"v Vassembling :the backing' ring Sfinto'posi'tionthereon. The assembled bearing hous- `ing-'^"t0"including thef'bearingmembers is now moved Conto lthe" Ane ck""10. 'Pressure ring 62is loosely located in {itspositionbycl-ampingdblock 66. 'A suitably designed hydraulic jack; ori yothersuitable pressure 'means,` is as- 1s`rbledbetween pressure `b1 ock62jand thrustring 18 Y'applies' suflicientpressuretor'seat'inner'races 24, 30 h"andfftightagainstbacking'ring 48 land on/tapered mill "olliiecki f' The-pressureis'thenreleased on the hy- ?"lraulicjackand thethrust'ring'lis removed from j'pt'hejgifoove l16 'permittingthei'thrust 'ringj20l and the 9th eadedi'c'sleeve'e'rnember 64 .to Ybe installed on the porkUtioiif-14"--of" "t`he neck 10. Thethrust ring`18 is'thenreinstalled Vin the kgroove 16, and theV threaded. member i 4'; is Sotated'onthrust ring 20"'until4 parts 62, 64,20 and f 8 lfarejjammedztight. Y."Mem'berj 64f-is theneither 'ad- 'ytmcedl further'or'slightly 'backed "oif' soithat locking ""crw'" 65 can be assembled in positionlas previouslyexj: lain-cn4 y, Y t, t

. The" mounting 21'slioivinlig. lfand' described'abowe "isfpa'rtcularly suitable for'heavy-mdhghsped yrolling removed from -the-vneck-so that-the innerv racesffwill be able to move to the left (Fig. 1)"whenf-loosed1trom the neck. Secondly, pressure uid isfed into the, passages 84 and 8l andiiito the groove`78. Y:""Bec'ause''of the taper of. the neck l0 and.ofthe.inneu11race-34'Which surrounds the groove 78, the pressure iluid has a force component in the axial direction which forces the race 34 to break loosesfrem the-.neck 10.-by-mevingetofthe lleft. lhirdly,

pressures-duid l is.-=fed v into the; :groove` 7 6 whielrsimilarly breaks `loosefthe :race "tlifrom thefneck-f-lt; and fourtlil-y,

pressure I fluidis fed into the groove 741 to loose-fthe' Trace ,.-Each time -f one of- @the `races 2 breaks Vor T'pops-loose :from

thefneck-lm.itjumps'etoather-left.(Fig. l) either-.striking the spacer 62- or t-lienextfadjacenttracetothetleft. When the-.middle or-double inner :race-Silfbreaks loose, it carries the chuckor housing: 4d with=itfto the l'eft. tHe'retofore,

the sudden breakingfloose-and.endwisezmovementot the housing d0 :resulted-inf? damagefto the. bearinginembers.

- However, `in a mounting constructedaccording-11o..the

g present-inventionyin which-the'ilangesisrproyided;the

lbearing members-:are protected. y'When-the housing-1:46

breaks loose with the race?@0,the'leftwardtmovementfot the.' housing 4@ -causesc .the iiange 60 toastr-ike.: the .radia- `cent end ofthe inner .-racel '24: instead of strikingatlie cage onthe rollers 22.

In Fig.- l; whenrmembers.18,@20fgand 64 :areremovcd from the neck, member 62 is stopped by clamping block 'fdwhenthe race-34;is loosened.ontheneck. kv'Vtlhen inner'race? 30 ris loosened; on the neckylangey 'tliinihousingr 40 is stopped by inner lrace; 724u` which is still tight. en

,-the.neck,l aiidfwhen, inner Yrace 24lisloosened 'onlthe neck vthe entire bear-ing liousing'assembly canberemoved-rom vthe-neck.

-1 In tha-modified bearing. assembly 96-sl1ownrin-ligI-2, the backing ring and the adjacent inner race-areiform'cd 1 integrally yrasmmember i90. Thisfconstructionpermits a reduction ,of-the distancefiomlthe innermostirWfof-ibearing'V rollerst22z-to thefend face -ZSY-of the mill rollbody -12iand.also.reduces the-.lengthvoflthe neck 10. f so providing it` iszpossiblet tolfha-ve stron-ger-lshorterneck Without .any loss-.inthe operational icharaeteristicsl there- .I Another -principal-.diterence between modied bearing mounting of Fig. 2randltlatdiscussedinconnectionlwith Fig. 1, `is in therconstruc'tionoflsleeve-membe'925(Fig.

..1 2)` and clamping block 94. #Instead fof using aV vflange `on the finboard sideo'f the bearing members, such'asflange 60- m Fig.E 1,1the breakingY shock-that occurs wh'enthe .innerzrace' 30'isseparated frornflthe'neick lll-in them'odied bearing mounting 96 is taken vby'"radially-'adjustable stop` `blocks 98I positioned lat the iouter end "ot-:the'clampv ing lb1oclc94-on the outboard 'sidefthere'of from the housing-40. 'Eff-'.l`he sliding blocks;V 98 are fastened to'the' outer end-foftheclamping -block `94Hby means' of fscrews or bolts 100 that extend through elongated slotsY {O2-.theref in. When removingfthe -bea'ringv mounting'l from' the 'threaded member -20' 'until' thespace between "the"mem ber 92 and block 94 is suiicientfoi the adjustablestop `blocks 98 tol slide down withatlest a clearance. A"ofi/13 ing loosening of the bearing memberaand the stop blocks 98 are held in theirnewposition wituboltfloo.

. Pressure iuid is then applied into the axial passages 84, 83 and 82 as described above yby means ofy suitableA fittings in the open ends thereof and into the respective grooves associated therewith. When pressure uid is applied into the passages 84 and 81 and into the groove '7,8 an axial force is exerted between the neck 10 and the inner race 34 which forces the members to separate from each other. Next pressure fluid is fed into the groove 76 through passages 83 and 80 to break loose therace 30. With the breaking loose of the race 30, the housing 40 moves to the left moving the outer races 36 and 3S therewith. The inner end of the housing 40 is provided with an annular groove 106 which is large enough to` permit the housing 40 to clear the rollers 22 t for a considerable distance so that the interposed stopblocks 9S strike the outwardly extending portion 104 of the sleeve member 92 to stop the leftward movement of the housing 40.

The unitary construction of the backing-ring and the inner race, the use of the stop blocks 98, and the enlarged portion 104 of the sleeve member 92 are the principal diierence in construction between the modified bearing mounting 96 and the bearing mounting 21 shown in Fig. 1. The operation of themodit'ied mounting 96 otherwise is similar to that of the mounting 21.

The further modification shown in' Fig. 3` incorporates most of the features of the modification of Fig. 2. The principal dierence between the modifications of Figs. 2 and 3 is in the innermost seall arrangement between the bearing housing 40 and the neck 10 or mill roll body 12. Innermost seal 108 in Fig. 2 is similar to the seal., 52 in Fig. 1, both being attached to the housing 40 and` lboth making sliding engagement with a cylindrical surface. In Fig. l the cylindrical surface is on the backing -nng 48 while in Fig. 2 the corresponding surface is on the member 90. In the Fig. 3 modification, a seal 12)l is positioned in an axially disposed groove 121 in the housing 40 and instead of making engagement on a cylindrical surface, 4it engages the end face 25 of the mill roll lbody 12. There are several advantages derived from the useof seal l120 of Fig. 3;principal among these are a still further reduction in the overall length of the neck 10 which further increases the strength thereof, and simplified installation of the bearing mounting 122 on the neck 10 because the seal 120 does not have to be tted onto a cylindrical surface. Fitting an annular seal to a cylindrical surface usually requires.considerableV care, and if the parts are not properly aligned` damage may 'result'to the seal. A. still Ifurther advantage of using the seal =120 is obtained by being able to clean" and:

replacethe seal 120 more readily. This is true because the sealing surfaces are exposed for cleaningand the seal can more easily be slid outof an axial positioning groove for replacing.

Itis now apparent that there has been provided a novel bea-ring mounting for artapered mill roll-neck ort-he "like, which fulfills all of the objectives and advantages sought Itherefor.

The foregoing description and the accompanying draw- -ings have 'been presented only by way of illustration and example, and changes and alterations in the present disclosure, which will be readily apparent to one skilled in the art, are contemplated as within the scope of the present invention which is limited only by the claims which follow.

What l claim is:

1. A bearing mounting for tapered journals comprising a tapered journal member, a bearing housing having bearing members positioned therein, said bearing members having a tapered opening therethrough for mounting on said tapered journal member, means for applying pressure fluid between the tapered journal member and the tapered opening in the bearing members to free the bearing members from the journal member, and axially asse,

spaced means on the journal member and on the bearing housing adapted to cooperate and limit displacement of lthe bearing housing relative to the journal memberV when said bearing members are free.

the journal member which move into cooperative er1- gagement during separation of the bearing members from the journal member `for limiting relative movement be- Y tween the journal members and-the housing.

3. The bearing assembly for tapered journals as dened inclaim 2 in which the portion of the axial spaced means on the housing include an inwardly extending ange and the portion of the axial spaced means on the journal member include an abutment on the journal member in spaced axial alignment wit-h said flange.

4. The Ibearing assembly for tapered journals as defined in claim 2 in which the axial spaced means include an inwardly extending member carried on the bearing housing in opposed axial alignment with an outwardly extending thrust ring carried on the journal member.

5. The bearing assembly for .tapered journals as dened in claim 3 inwhich the axial spaced means are positioned adjacent to the bearing members on the side' thereof associated with the larger diameterl portion of the tapered journal member.

6. The bearing assembly for tapered journals as defined in claim 4 in which the axial spaced means are positioned adjacent to the Ibearing members on the side thereof associated with the smaller diameter portion of the tapered journal member.

7. A bearing mounting for tapered rotary members comprising a tapered rotary member; a bearing housing; bearing members positioned in the bearing housing and capable of movement relative theretosaid bearing members having a tapered opening therethrough which is interference fitted on the tapered rotary member, chamber means formed between the bearingmembers and the tapered rotary member and adjacent to the interference tit, said chamber. means including connecting passage means in the rotary member adapted to be connected to a source o f pressure uid for introducing said pressure iluid into the chamber means for breaking the interference fit and forcing `one of the bearing members to move relative to the bearing housing, and axially spaced cooperating members carried on the bearing housing and on the tapered rotary member for coactingwith each other and to limit relative axial movement therebetween when the interference fit is broken.

8. A bearing assembly for a tapered journal comprising a tapered journal member, a bearing housing, antifriction bearing members positioned in said housing and capable of endwise movement relative thereto, said bearing members including at least one inner race member having a tapered bore extending therethrough which is interference fitted on said tapered journal member, chamber means formed between the tapered journal member and said inner race member adjacent to the interference fit therebetween, said chamber means including passage means` in the journal member which are adapted to be connected to a supply of pressure duid which is introduced into ythe chamber means for breaking the interference t between the inner race member and the journal member, a flange on said bearing housing and a' cooperating abutment on the journal member positioned in spaced axial relation to limit relative movement therebetween when the inner race is' loosened from said journal member, and aseal positioned between said bearing housing and saidy journal for sealing therebetween.

9. A bearing assembly for a tapered mill roll neck comprising a bearing housing, anti-friction bearing members positoned in said housing at least one member thereof being capable of'endwise movement relative to the housing, said bearing members including at least two inner race members having a tapered bore extending therethrough, a mill roll having an endwise extending tapered neck, said neck being interference tted to the inner race members in the tapered bore,r chamber means formed between the taperedv neck and at least one of said inner race members, said chamber means including connecting passage means adapted to bev connected to a supply ofpressure fluid which is introduced therein to loosen the associated inner race member and the bearing housing from the neck by breaking the interference iitvbetween the inner raceA and the neck, a flange on said bearing housing and an abutment surface on said neck, said flange and abutment lsurface being in axial spaced alignl ment to cooperate with each other and limit relative axial movement between said housing and said neck when the interference t is broken, and means on said bearing housing for slidably sealing between the bearing housing and the neck.

l0. The bearing assembly for a tapered mill roll neck as deincd in claim 9 in which one of said inner race members is formed integral with a backing ring.

ll. A bearing assembly for tapered journal members comprising a tapered inner race including a backing ring portion, said inner race being force iitted onY a tapered journal member, an outer race, anti-friction members positioned between said inner and outer races, chamber means formed between said inner race and the journ-al member including passage means thereinto for injecting pressure Huid in said chamber to loosen said innerrace on the journal member, and axially spaced abutments on said journal member and-saidouter race for restricting relative movement between said members when said inner race is loosened from said journal member.

l2. A bearing assembly for a tapered mill roll neck comprising a bearing housing, an anti-friction bearing assembly positioned in said housing at least one member thereof being capable of endwise movement relative to the housing, said bearing assembly including at least two inner race members having a' tapered bore therethrough, a mill roll having an endwise extending neck with a ta pered outer surface, said neck being pressureiitted to the iner race members in the tapered bore, chamber means formed in the outer surface of the tapered neck between the neck and at least one of said inner race members, said chamber means including passage means adapted to be connected to a supply of pressure uid which is introduced therein to loosen the associated inner race member and the bearing housing from the neck by breaking the pressure tit between said inner race and the neck, a flange on said bearing housing and an abutment surface on said neck, said flange andl abutment surface being in axial spaced alignment to cooperatively engage each other and limit relative axial movement between'said housing and said neck whenlthe pressure lit is broken, and means on said bearing housing providing a sliding 'seal between the' bearing housing and the mill roll.

13. The bearing assembly' for a tapered mill roll neck as deiined' in claim l2" in which onetof said inner race members includes an integral backing ring portion which extends to adjacent said mill roll.

14. A bearing assembly' for a tapered mill roll neck comprising a bearing housing, a bearing assembly positioned 'in said housing and including at least one member thereof capable of endwise movement relative to the housing. said bearing assembly also including at least two inner race members having a tapered bore extending therethrough, a mill roll having an endwise extending tapered neck interference tted in the tapered bore to the inner race members, first chamber means formed between the tapered neck and one of said inner race members, second chamber means formed between the tapered neck and the other inner race member, each of said chamber means including connecting passage means adapted to be connected to a supply of pressure lluid which is introduced therein to loosen the associated inner race members from the neck by breaking the interference iit therebetween, a pair of spaced abutment members positioned adjacent each end ofv said bearing assembly, one of each of said pairs of abutment members being connected to'the neck and the other member of each of said pairs of abutment members being connected to the housing, the abutment members 4in each of said pairs being in axial spaced alignment, :one pair of said pairs of abutment members limiting relative axial movement of the associated inner race member when said' inner race member is loosened from the neck, and said other pair of abutment members limiting relative axial movement between said housing and said neck when the associated inner race is loosened from said neck. V

l5. In a bearing assembly Yincluding a tapered journal, a cooperating housing, a bearing having a tapered openingl to receive said tapered journal and sized to lit within said housing, a pressure fluid passage in said journal opening in a channel in the tapered portion of said journal received in the tapered opening of said bearing, and stop means carried between said journal and housing adjacent said bearing, said stop means normally providing a space for permitting movement of one of said housing and bearing relative to said journal-upon pressure iluid supply to said passage and channel in disassembly of the bearing assembly.

References Cited in therle of this patent Y UNlTED STATES PATENTS 2,840,399 Harless et al. 'Iuly 26, 1952 

